Model is 5'5, 34B, size 6 wearing a Small
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Informations: size XS: length 112 cm, chest circumference 96 cm, sleeve length 66cm size S: length 113 cm, chest circumference 100 cm, sleeve length 66cm size M: length 115 cm, chest circumference 104 cm, sleeve length 66,5cm size L: length 117 cm, chest circumference 108 cm, sleeve length 68cm size L: length 119 cm, chest circumference 112 cm, sleeve length 69cm You can check the size chart here
Bright or dark-colored undershirts will show through light dress shirts
For example, a mustard yellow shirt with a light grey pair of pants and a dark grey blazer